KWKloeber-
I re-read the harness page on the C30 site and it makes sense now. I pulled the panel last night and took a good look at how everything is wired. Thankfully, the most critical hazards were already corrected by previous owners. The original wire harness connectors have been replaced by terminal strips and are no longer in service. There is definitely still room for improvement and I will work my way through the list of recommended wiring changes. My wiring matches the diagram here, except I have an extra wire on the key switch 'I' terminal for the fuel pump.
https://www.catalinadirect.com/images/features/Z4644%20Wiring%20Diagram.pdfThe yellow wire pictured is a jumper from the AO to alternator sense.
I hadn't considered what would happen if my house bank ended up being completely run down. It's true that I would lose fuel pump, glow, starting solenoid, etc.
Assuming the panel feed is left on the start battery and the AO goes to the house battery, will there be issues with the alternator excite or AC output to the tach? Or are those all electrically isolated within the alternator? If those are isolated, then maybe this is a non-issue. I'd see my starting battery voltage (when not combined) rather than monitoring the alternator, but maybe that's okay with me.
Thanks again to all of you for walking through this with me.